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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a3f3086026bdaa7893c6d99942c271649f6c4c1760c9f431f598338ed1bc79' 
  AND token = 'SsZygwPlcdmZS2V1TD3Hzg0iUb84rWa9jkORuBhHg98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}